1.The diagram shows the changes caused in a cell by the hormone glucagon when it combines with a receptor in the cell surface membrane. (a)Name one organ in the human body containing cells with...

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1.The diagram shows the changes caused in a cell by the hormone glucagon when it combines with a receptor in the cell surface membrane. (a)Name one organ in the human body containing cells with glucagon receptors. .................................................................................................................................... (1) (b)(i)Using the diagram, explain how an injection of a small amount of glucagon into the body could cause a rapid increase in the concentration of glucose in the blood plasma. .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... (3) (ii)The blood glucose concentration would return to its normal value within one hour of injecting glucagon. Explain how. .......................................................................................................................... ..................................................................................................................(cont) .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... (3) (Total 7 marks) 2. The diagram shows dendrites from each of two neurones, A and B, forming synapses with a third neurone, C. Concentrations of some ions are also shown. Ion concentration/mmol dm–3 Na+ K+ Cl– Outside neurone C 145 12 120 Inside neurone C 12 155 5 (a)Acetylcholine increases the